Dab tsi yog qhov muaj pes tsawg leeg ntawm ASTM A671?
Standard Source: ASTM A671 yog tus qauv tsim los ntawm American Society for Testing and Materials (ASTM), lub npe hu ua "Electrofusion Welded Steel Pipes for Atmospheric and Cryogenic Pressures".
Cov txheej txheem tsim khoom: Ua haujlwm electrofusion vuam (EFW) thev naus laus zis, uas siv cov cua sov uas tsim los ntawm cov hluav taws xob tam sim no kom yaj thiab fuse cov npoo ntawm cov phaj hlau, ua ib qho txuas txuas ntxiv thiab ruaj khov.
Cov yam ntxwv tseem ceeb: Tshwj xeeb yog tsim los rau cov cheeb tsam cryogenic, ua kom pom qhov zoo heev uas tsis tshua muaj siab -kub toughness thiab tsis kam rau nkig tawg.
Cov ntsiab lus ntawm ASTM A671
A671 yeeb nkab specification
Khoom npe: EFW PIPE ASTM A671 yeeb nkab
Sab nraud txoj kab uas hla: 406mm-1422mm
Phab ntsa Thickness: 8mm-30mm
Ntev: 12m, 14m, 16m, 26m, 30m
Txuj: ASTM A671 / 671M
Khoom siv: A671 CA55, A671 CB60, A671 CB65, A671 CB70, A671 CC60, A671 CC65, A671 CC70, A671 CD70, A671 CD80
Daim ntawv thov: Atmospheric thiab qis kub
A333 V.S. A671
| Sib piv Dimension | A671 steel yeeb nkab | A333 steel kav |
|---|---|---|
| Standard txhais | ASTM A671 Cov Lus Qhia:Hluav taws xob-fusion-welded (EFW) steel kav rau atmospheric thiab qis kub, tsim los rau qis- qhov kub thiab txias ib puag ncig, hais txog qhov zoo ntawm cov vuam zoo thiab qis- qhov kub thiab txias. | ASTM A333 Cov Lus Qhia:Seamless thiab welded steel kav rau qis - kev pabcuam kub, npog ob qho tib si seamless thiab vuam txheej txheem, muaj feem xyuam rau ntau yam ntawm qhov kub thiab txias. |
| Kev tsim khoom | Hluav taws xob{0}} fusion vuam (EFW): Weld seams tsim los ntawm melting steel phaj npoo nrog hluav taws xob tam sim no; covyuav tsum tau kho cua sov(piv txwv li, normalizing, tempering) kom optimize low-kub toughness; cov100% tsis yog-kev kuaj vuam vuam. | Seamless los yog welded: Seamless kav ua los ntawm kub dov / txias kos duab; welded kav siv submerged arc vuam (SAW) thiab lwm yam txheej txheem; qee qib xav tau kev kho cua sov tab sis tsis tas yuav tsum tau kuaj xyuas tag nrho. |
| Tsawg-Kev ntsuas kub ua haujlwm | Qib los ntawm qis-kub toughness (piv txwv li, CL13, CL22, CL26); CL22 muaj qhov tsawg kawg nkaus kev pabcuam kub ntawm-45 degreenrog Charpy cuam tshuam lub zog Ntau dua lossis sib npaug rau 27J; CL26 tuaj yeem ncav cuag-100 degree(ntxiv rau -196℃hauv qee qhov xwm txheej). | Kev muab qhab nia zoo (piv txwv li, Gr.1, Gr.3, Gr.6); Gr.6 muaj qhov tsawg kawg nkaus kev pabcuam kub ntawm-50 degree(lub zog cuam tshuam ntau dua lossis sib npaug rau 18J); Gr.3 tiv-150 degree; Gr.1 haum rauhauv qab -45℃rau -253 degree(liquid helium ib puag ncig). |
| Lub zog -Toughness Balance | tsom raulow-kub toughness + siab -siab load- bearing; Qib CL26 muaj lub zog tawm los Ntau dua lossis sib npaug ntawm 415MPa, haum rau siab -siab, qis- qhov kub ntawm cov kav dej loj. | Hais txoglow-kub toughness ua ntej; lub zog qis dua me ntsis (piv txwv li, Gr.6 tawm lub zog ntau dua lossis sib npaug ntawm 240MPa); zoo dua rau ultra-low-kub seamless scenarios. |
| Weld Quality Requirements | 100% tsis yog -kev kuaj kev puas tsuaj(radiographic/ultrasonic) kom ntseeg tau tias xoom weld defects; adapts rau siab -siab, loj- txoj kab uas hla (piv txwv li, LNG lub ntsiab pipeline φ508mm). | Weld xeem nyob ntawm qib; qee qhov yuav tsum tau kuaj xyuas qhov chaw xwb; tsim nyog rau me me - txoj kab uas hla los yog tsawg dua weld- cov xwm txheej tseem ceeb. |
| Hom Daim Ntawv Thov Scenarios | LNG kis tau tus mob loj pipelines, Arctic roj thiab roj extraction, muaj roj cia thiab kev thauj mus los (kua nitrogen, kua oxygen), tshuaj reactor sib txuas. | Ultra-low-kub seamless pipelines(piv txwv li, kua oxygen / argon kis tau tus mob), me me - nplai LNG nroj tsuag, qis- cov khoom siv ntsuas kub, aerospace cryogenic systems. |
| Nqe lus qhia thiab xaiv | Tus nqi siab dua (vim tag nrho kev tshuaj xyuas thiab kev kho cua sov); haum rausiab-siab, loj- txoj kab uas hla, qis- kub lub ntsiab pipelines(piv txwv li, LNG davhlau ya nyob twg lub ntsiab kab). | Tus nqi qis dua; haum rauultra-low-kub seamless xav tau los yog me me - txoj kab uas hla pipelines(piv txwv li, kuaj kua nitrogen kav, me me tank sib txuas). |
